Oil switch



June 23, 1931. J. RAH 1,811,805

OIL SWITCH Filed April 7. 1927 2 Sheets-Sheet 1 llllll/lllll/li/L v/ @www A June 23, 1931. Y J, RAH 1,811,805

i OIL SWITCH Filed April '7, 1927 2 Sheets-Sheet 2 Patented June 23, 1931 UNITED STATES PATENT OFFICE JOSEPH BAH, OF CHICAGO, ILLINOIS, ASSIGNOR T0 G. & W. ELECTRIC SPECIAL-TY COM- PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS OIL` SWITCH Application filed April 7, 1927.

line.

It has formerly been the custom in repair, installation or service conditions to provide a switch of some type for section alization or transmission but it has been found that due to imperfect contact of the switch bar or the unsatisfactory mode of contact, there may be faulty delivery of the current, or the parts of the switch may become damaged causing the whole line to be put in disuse with the attendant inconvenience.

It is therefore an object of this invention to provide a switch of such character that there is always proper contact between the switch and the cable lead terminals.

It is another object to provide a switch that is self-aligning.

It is a further object to provide contact members for the cable lead terminals of such character that any arcing between the switch and the terminals upon a breaking of the connection, will not burn out the Contact or cable terminals.

It is a further. and more specific object to provide terminal and switch shoes of such forni as to insure a perfect and rubbing contact between the switch and the shoes.

Other and more specific objects will occur from the detailed description given.

In the drawings- Figure l is an elevation, partly in section, of the oil switch, showing the contact arm in open or inoperative position; and

Figure 2 is a section of Figure 1 taken substantially at right angles thereto, showing particularly the operating mechanism for the switch arm.

In general, A is an oil switch having a lower oil carrying receptacle B. C and E are the usual cables provided with terminals which are adapted to be connected by the switch arm or block D.

More particularly, 1 represents the oil switch housing, at the bottom of which the insulating oil carrying receptacle 2 is disposed having the oil plug 3 therein. he

Serial No. 181.667.

sides andvbottom of said receptacle are insulated by suitable means 4 and 5. The bottom is provided with insulating partitions 6 which are disposed so as to sectionalize the plurality of switch blocks provided in the oil receptacle and to similarly separate the corresponding leads C and E provided in the receptacle. Any number of cable leads 7 may be provided, connected through suitable connections which form no particular part of the invention, to terminals or conductors 8 disposed in insulating tubes 9 extending between the upper partof the housing and the lower oil containing receptacle through the insulating base 30. Each terminal is provided with a flattened lower portion provided with suitable fastening means 11 for a supporting spring 12 towhich a' shoe 13 is` attached by any suitable connection19,each

shoe preferably extending slightly into:y the'` path of movementy ofthe switch block.

The terminal is provided with a lug 20 which serves as positioning means for `a spring 14 disposed between the terminal and the shoe, the head of connection 19 also providing positioning means for said sp1-lng. Limiting means 15 may be provided between the shoe and the terminal, a suitable recess 16 being Vprovided in the shoe for receiving the bent end of said limiting means, which may conveniently be in the form of a tapped elbow or L-shaped bar. The shoe is provided with a flat switch engaging portion 17 and an arcuate nose 18 for guiding the switch block to final operative position. An arcing spring 21 may be providedl between the terminal and the shoe so that when contact is made or broken from the shoe and the switch block, the shoe-holding spring 12 will not be burned out due to any arcing action between the switch block and the shoe.

The switch block is of general I-section, provided with the shoe contacting ends 23 which are provided with arcuate noses, said contacting portions being connected by a body portion 22 hinged at or near the center thereof to an insulating link 26 which is pivoted to the bell-crank 27. Any other lead, such as 25, which may enter the oil switch through the top and through the correspond- S OA ing tube such as 9, is provided with a correspending terminal with a shoe similar to the shoe 13, but facing it for electrical connection thereto by the contact block D. On either side of the switch blocks and disposed between the block and the shoe spring and terminal connection, insulation 211 may be provided extending to a position adjacent the shoe. The switch operating mechanism consists of a key receiving ineans 29 which eX- teiids through the receptacle housing and which, through the arniQS, operates the bell crank 27 which is connected to the switch block D through the insulating link 26. Iiisulating base 30 is provided between the oil receptacle and the terminal receiving portions of the oil switch housing, the saine being apertuied to receive insulating sleeves 9. It has been found convenient to torni the receptacle in a plurality of parts, such that the wiping sleeve, the terminal receiving portion, and the oil receptacle are all separate so that the connections of the leads, the switch, the terminals and the shoes are absolutely accessible.

Iii operation, it will be understood that the switch block D is in contact with the shoes 13 and that thereby the cable leads 7 and 25 are in electrica-l connection. It will be understood that any number ot said oil switches may be provided between the Jfeeder and sections ot the lines and it any trouble occurs in the line, by moving the switch block to inoperative position, that section may be cut out while the rest of the line will still be in use. Uien contact is desired between the shoes, it is only necessary to move said shoes by applying a key to the means 29 and operating said switch block through the bell crank 27. It will be seen that should the switch block first contact one shoe, due to its pivotal connection to the link 26 and the flexible mounting ot the other shoe, the contact made between said shoes and the switch block will still be perfect due to the action o'j guiding noses on the shoes and switch block which cause a wedging action, and the rub-- bing contact effected between said switch block and said shoes when the block pulled into iinal operative position.

I do not wish to be limited by the parts or forni of the device shown, which it is to be understood ai'e only by way of illustration and not limitation, as other and various toi-ins oi the device will oi course occur to those skilled in the art.

I claim:

In a switch the combination of a casing including an oil receptacle, xed electrodes extendinginto said oil receptacle below the oil level thereof, contact slices, inea-ns resiliently connecting said contact shoes and electrodes, resilient means disposed between said shoes and electrodes for urging said shoes away from saidr electrodes, a contact block having contact shoes thereon, means for movingl said contact block whereby said shoes contact said iist named shoes for electrically connecting said electrodes, said shoes having noses shaped to guide said shoes into rubbing contact, arcing leaves carried by said electrodes and aligned with the noses of the associated shoes, and means on said electrodes coopeiating with the shoes carried thereby tor limiting the position thereof and presenting said shoes 'for Hat surface engagement by the shoes of said contact block.

Signed at Chicago, Illinois, this 2nd day ot' April, 1927.

JOSEPH BAH.

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